Polishing-wheel.



1 pretrial) s-Tarrns PATENT OFFICE.

DANIEL I, MQGOVERN, OF MONTPELIER, VERMONT, ASSIG-NOR TO C. C. PUTNAM,EXEGUTQR 0F PRENTICE C. WRIGHT, DECEASED, AND ADMINISTRATOR OF MEDADWEIGHT, DECEASED.

POLISHING-WHEEL,

Specification of Letters Patent.

Patented Jiny'es, 1914.

Application filed-September 1a, 1913. Serial No. 789,668.

To all whom it may concern Be it known that I, DANIEL FREDERICKMcGovern, a citizen of the United States, residing at- Montpelier, inthe county of Washington and State of Vermont, have invented certain newand useful Improvements in Polishing-Wheels, of 'which the following isaspecification, reference being had therein to the accompanying drawing.

The polishing-wheel provided by this invention. is designed particularlyfor use with einery or other abrasive in smoothing and polishinggranite, marble, or other stone, and it also may be used on othermaterials,

The device includes flanges or scrolls that. are held together in theproper relative po sitions without the employmentof a disk, and theflanges or scrolls are uncovered except over small areas where they areat tached to a cross member. This makes it convenient to place abrasivefrom the top of the wheelbetwcen the scrolls where it is available foraction between them and the surface being treated; and, when theabrasive is spread over the surface being treated, it has a tendency towork upwardly from between the scrolls and off the top of the wheel andto return .to the sur ace, whereby a substantially continuous movementof abrasive is maintained and the ciency of action enhanced.Theparticular construction and arrangement of the flanges or scrolls 9fthe wheel are such that during rotation the centrifugal tendency ofabrasive to be thrown from under the wheel is counteracted and theabrasive is kept where itis capable of efficient action against thesurface being treated, and the wheel has been found in practice to causea more equal dis-'- tribution of abrasive than in wheels commonly inuse.

The construction of the wheel and ar-.

rangement of its parts will be apparent from the accompanying drawing,forming part spondingparts int-he views of the drawing, of whichi Figure1 is a top view of the polishing; wheel; Fig. 2 is a side view; and Fig.3 is a bottom view.

Haring more particular reference to thedla mg, ,4 designatesdiametrically-positiolled S members, which extend from the peripherysufficiently near to the center of the wheel to connect with the innerscrolls mentioned hereinafter. In order to afford a connecting means ator near the center of the, wheel for a shaft or other element forrotating the wheel over a surface being treated, a member or bar 5,spanning. the space at the center between the cross members and withinthe inner scrolls, is attached to those members by bolts 6. or the crossmembers and member 5 may be formed integrally. The cross incrnbersconstitutea holding means for the ring and scrolls mentioned hereafter.i a

An outer annular ring 7 is secured to the under sides ct the crossmembers ator.

near their outer ends, and within the ring there are a plurality ofspiral scrolls 8. The under sides of the ring and scrolls are in thesame plane, and the cross members are comparatively narrow so that theycover only small portions of the scrolls.

The scrolls are of sufficient length and curve to extend from one crossmember to the other, to which portions they are secured at their endsand held in spaced substantially parallel relation so that there arechannels 9 between them, which are open at the top,

Although there maybe one or any other desired number of sets of scrollsand more than one set of cross members, in the embodiment shown in-dthedrawing as'illus;

trative of the principles of the invention,

one set of cross members and two sets of scrolls are used, the scrollsof eac set from the periphery'oi the wheel tower .the center beingdesignated by the characters A, B, C, and

The scrolls are so arranged and curved,

that the rear end of every scroll of a set has position nearer thecenter of the wheel than the front end of the corresponding scroll ofthe other set, so that all scrolls of each set, except the two innerones D, .terminute in front of the channels between the correspondingscrolls of the other set and the scrolls .next inwardly thereof. Thisarraniement imparts-t0 abrasive discharged at t c end of one channel atendency to go into a channel of the next succeeding set that is nearerthe center of the wheel, and thus the tendency of abrasive to be thrownfrom under the wheel under centrifugal infiuence to agreat extent isnullified.

The crossmembers, ring, and scrolls in practice preferably are castasanintegral unit. However, if desired, the parts may be formed separatelyby casting, forging, or otherwise, and connected" by any suitablemeans'tfoiorm a complete wheel.

Having thus described myinvention, what I claim as new, and desire "tosecure by Let-' ters Patent,

1. A polishing-wheel comprising a holding member, and sets of scrollssecured thereto'having channels therebetween, the parts being soarranged that some scrolls of a set terminate in front of the channelsbetween the vcorresponding scrolls of another 'set and the scrolls nextinwardly thereof.

2'. A polishing-wheel comprising a holding member, and sets of scrollssecured thereto having channels therebetween that are open at the top,the parts being so arranged that some scrolls of a set terminate infront of the channels between the corresponding scrolls of another setand the scrolls next inwardly thereof.

In testimony whereof I ailix my signature in presence of two witnesses.

DANIEL F. MCGOVERN;

Witnesses:

GEORGE L. HUNT, MILDRED A. HOUSE.

